GHSA-G53G-W8RJ-FMG7 xmldom PI grammar regex ReDoS: quadratic backtracking on unterminated processing instructions

Summary @xmldom/xmldom's processing-instruction PI grammar regex exhibits quadratic-time backtracking ReDoS when parsing an unterminated processing instruction. A single small XML document containing forces the regular expression engine into On² work, stalling the Node.js event loop. The input is...